MAKEB Builds the FDPF matrices, B prime and B double prime.
[BP, BPP] = MAKEB(BASEMVA, BUS, BRANCH, ALG) returns the two
matrices B prime and B double prime used in the fast decoupled power
flow. Does appropriate conversions to p.u. ALG is either 'FDXB' or
'FDBX', the corresponding value of MPOPT.pf.alg option specifying the
power flow algorithm.
Note: For backward compatibility, ALG can also take on a value of
2 or 3, corresponding to values of the old PF_ALG option. This usage
is deprecated and will be removed in a future version.
Example:
[Bp, Bpp] = makeB(baseMVA, bus, branch, 'FDXB');
See also FDPF.0001 function [Bp, Bpp] = makeB(baseMVA, bus, branch, alg) 0002 %MAKEB Builds the FDPF matrices, B prime and B double prime. 0003 % [BP, BPP] = MAKEB(BASEMVA, BUS, BRANCH, ALG) returns the two 0004 % matrices B prime and B double prime used in the fast decoupled power 0005 % flow. Does appropriate conversions to p.u. ALG is either 'FDXB' or 0006 % 'FDBX', the corresponding value of MPOPT.pf.alg option specifying the 0007 % power flow algorithm. 0008 % 0009 % Note: For backward compatibility, ALG can also take on a value of 0010 % 2 or 3, corresponding to values of the old PF_ALG option. This usage 0011 % is deprecated and will be removed in a future version. 0012 % 0013 % Example: 0014 % [Bp, Bpp] = makeB(baseMVA, bus, branch, 'FDXB'); 0015 % 0016 % See also FDPF. 0017 0018 % MATPOWER 0019 % $Id: makeB.m 2229 2013-12-11 01:28:09Z ray $ 0020 % by Ray Zimmerman, PSERC Cornell 0021 % Copyright (c) 1996-2010 by Power System Engineering Research Center (PSERC) 0022 % 0023 % This file is part of MATPOWER. 0024 % See http://www.pserc.cornell.edu/matpower/ for more info. 0025 % 0026 % MATPOWER is free software: you can redistribute it and/or modify 0027 % it under the terms of the GNU General Public License as published 0028 % by the Free Software Foundation, either version 3 of the License, 0029 % or (at your option) any later version. 0030 % 0031 % MATPOWER is distributed in the hope that it will be useful, 0032 % but WITHOUT ANY WARRANTY; without even the implied warranty of 0033 % MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 0034 % GNU General Public License for more details. 0035 % 0036 % You should have received a copy of the GNU General Public License 0037 % along with MATPOWER. If not, see <http://www.gnu.org/licenses/>. 0038 % 0039 % Additional permission under GNU GPL version 3 section 7 0040 % 0041 % If you modify MATPOWER, or any covered work, to interface with 0042 % other modules (such as MATLAB code and MEX-files) available in a 0043 % MATLAB(R) or comparable environment containing parts covered 0044 % under other licensing terms, the licensors of MATPOWER grant 0045 % you additional permission to convey the resulting work. 0046 0047 %% constants 0048 nb = size(bus, 1); %% number of buses 0049 nl = size(branch, 1); %% number of lines 0050 0051 %% backward compatiblility (deprecated) 0052 if ~ischar(alg) 0053 if alg == 2 0054 alg = 'FDXB'; 0055 elseif alg == 3 0056 alg = 'FDBX'; 0057 end 0058 end 0059 0060 %% check for valid ALG value 0061 alg = upper(alg); 0062 if ~strcmp(alg, 'FDXB') && ~strcmp(alg, 'FDBX') 0063 error('makeB: ''%s'' is not a valid value for ALG', alg); 0064 end 0065 0066 %% define named indices into bus, branch matrices 0067 [PQ, PV, REF, NONE, BUS_I, BUS_TYPE, PD, QD, GS, BS, BUS_AREA, VM, ... 0068 VA, BASE_KV, ZONE, VMAX, VMIN, LAM_P, LAM_Q, MU_VMAX, MU_VMIN] = idx_bus; 0069 [F_BUS, T_BUS, BR_R, BR_X, BR_B, RATE_A, RATE_B, RATE_C, ... 0070 TAP, SHIFT, BR_STATUS, PF, QF, PT, QT, MU_SF, MU_ST, ... 0071 ANGMIN, ANGMAX, MU_ANGMIN, MU_ANGMAX] = idx_brch; 0072 0073 %%----- form Bp (B prime) ----- 0074 temp_branch = branch; %% modify a copy of branch 0075 temp_bus = bus; %% modify a copy of bus 0076 temp_bus(:, BS) = zeros(nb, 1); %% zero out shunts at buses 0077 temp_branch(:, BR_B) = zeros(nl, 1); %% zero out line charging shunts 0078 temp_branch(:, TAP) = ones(nl, 1); %% cancel out taps 0079 if strcmp(alg, 'FDXB') %% if XB method 0080 temp_branch(:, BR_R) = zeros(nl, 1); %% zero out line resistance 0081 end 0082 Bp = -imag( makeYbus(baseMVA, temp_bus, temp_branch) ); 0083 0084 %%----- form Bpp (B double prime) ----- 0085 if nargout == 2 0086 temp_branch = branch; %% modify a copy of branch 0087 temp_branch(:, SHIFT) = zeros(nl, 1); %% zero out phase shifters 0088 if strcmp(alg, 'FDBX') %% if BX method 0089 temp_branch(:, BR_R) = zeros(nl, 1); %% zero out line resistance 0090 end 0091 Bpp = -imag( makeYbus(baseMVA, bus, temp_branch) ); 0092 end